[Patch fortran] PR32957 - C/Fortran interoperability and -fdefault-integer-8

[Thomas Koenig]

Hi Dominique,

> OK for trunk? back port?

OK for trunk.

The tests were non-conforming before, so this is also a
step in making our testsuite better.

For gcc-7, I'm not sure I would bother, but OK if
you want to do it.

Regards

	Thomas